radeon: disallow glamor on pre-R600 asics

I'm not sure they can handle the shaders properly, especially
only older parts like r300.

This will avoid display corruption problems reported by people
using glamor on older asics by falling back to EXA if they try
and enable glamor.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

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